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Choroid plexus of lateral ventricle

The choroid plexus of the lateral ventricle is a highly vascularized, villous structure located within the body and atrium (trigone) of each lateral ventricle in the brain. It consists of a network of capillaries surrounded by specialized ependymal cells and pia mater, forming the blood–cerebrospinal fluid (CSF) barrier. The primary function of the choroid plexus is the production and secretion of CSF, which cushions and nourishes the brain and spinal cord. It is crucial in maintaining the brain's microenvironment and participates in immune surveillance.

Synonyms

  • Plexus choroideus ventriculi lateralis

  • Lateral ventricle choroid plexus

  • Choroid plexus (of lateral ventricle)

Arterial Supply

  • Anterior choroidal artery: Branch of the internal carotid artery, supplies the anterior portion of the choroid plexus in the lateral ventricle.

  • Posterior lateral choroidal arteries: Branches of the posterior cerebral artery, supply the posterior part (mainly the atrium and body).

Venous Drainage

  • Choroidal veins: Drain blood from the choroid plexus and empty into the internal cerebral vein, which then contributes to the vein of Galen.

Function

  • CSF Production: Main site for the synthesis and secretion of cerebrospinal fluid.

  • Homeostasis: Regulates the composition of CSF and removes metabolic waste from the brain.

  • Barrier Function: Forms the blood–CSF barrier, restricting the passage of certain substances.

  • Immunological Role: Contains immune cells, contributing to immune surveillance within the CNS.

MRI Appearance

  • T1-weighted images: The choroid plexus typically appears isointense  to brain parenchyma; can be hyperintense if calcified or hemorrhagic.

  • T2-weighted images: Generally hyperintense due to its vascularity; calcifications, if present, appear hypointense.

  • FLAIR: The choroid plexus is slightly hyperintense or isointense; does not suppress like CSF, helping to distinguish it from the ventricular fluid.

CT Appearance

  • Non-contrast CT: The choroid plexus appears as a soft tissue density structure within the lateral ventricles.

  • Calcification: Frequently, physiological calcifications are visible, especially in adults and the elderly, appearing hyperdense (bright) on CT scans.

MRI images

choroid plexus of lateral ventricle hippocampus area coronal 3t image

choroid plexus of lateral ventricle mri 3t coronal image